In complex and variable urban gas application environments, traditional detection methods have obvious deficiencies in sensitivity, mobility, and real-time performance, which restricts the requirements for refined inspection. Therefore, focusing on the gas leakage detection task, this paper analyzed the selection and integration requirements of high-sensitivity detection equipment, constructed an integrated system architecture based on a robotic dog platform, and completed the modular design and implementation in terms of structure, power supply, control, and communication. This effectively improved the deployment capability and detection performance of the equipment in actual environments.